Pump



Sept. 2, 1924. 1,507,062

F. D. HOFFMAN PUMP 'Filed Oct. 10 1923 erence being had to the accompanying draw- Patented Sept. 2, 1924.

rnnn nyirorrrmn, or KANSAS my, ivrrssonarf PUMP.

Application filed October 10, 1923. Serial No. 667,646.

To all whom it may concern Be it known that I, FRED D. HOFFMAN, a citizen of the United States, residing at Kansas City, in the'county of Jackson and State of Missouri, have invented certain new and useful Improvements in Pumps; and I'do declare the following to be a full, clear, and exact description ottheinvention, such as will enable others skilled in the artto which it appertains to make and use the same,'refings, and to the figures of reference marked thereon, which form a part of this specification.

a well pump which is so constructed that water may be raisedat a greater depth than is possible with the ordinary lift pump; The result is accomplished by providing a pair of connecting cylinders with pistons therein havlng' alternating suction and compression stroke, that is when one piston is moving on itssuctlon stroke'the other is moving on its compression stroke and vice versa,

the pistons becoming alternately force and suction pistons, the water being-delivered on the suction side of-the pump, there being certain valve mechanism cooperating with the pistons to produce the desired result." The novel construction of the inventionavi-ll be= apparent by reference to the follow1ng'description in connection with the accompanying drawings, in which' a Q Fig.1 is a vertical longitudinal sectional view througha pump constructed in accordance with my invention.

Fig. 2 is a cross sectional view at the center line of the pump, one of its barrels being shown in elevation. V V

Fig. 3 is a cross sectional view through one of the pump barrels showing the flap valve co-operati'ng therewith.

Referring now to. the drawings by nu-' merals of reference, 1 and 2 designates the two cylinders of the pump having depending tubes or barrels 3 and 4: connected at their 7 lower ends. by semi-cylindrical chamber 5 divided'into'an inner compartment 6 and an outer compartment 7 The barrels 3 and i and the chamber 5 provide a'U-shaped structure. The compartmentsfi. and 7 communi-' cate with'the barrels 3 and 4; at their upper ends, the partition 8 dividing them, extending across the lower ends of the barrels to provide the compartment .7 at all times in This invention'relates to pumps and the primary object of the invention is to provide communication with the barrels and the com partment 6 which alternately and intermittently communicates with the respective barrels dependent uponlthe stroke movements of the pistons 9 and 10 in the cylinders 1 and.

2. The upper ends of the partition Scarries flap valves 11 and 1'2- which are adapted to swing inwardly to closing positions and contact with the stopslSxand 14, the outward swinging movement of the valves however is limited by the fingers 15 and 16 which may contact withthe top plate 17 of the compartment 6. Theltopplate 17 is provided with the valve seat 18 having a spider 19 therein through which may reciprocate a valve stem 20 having on its'lower end an in the seat 18. The stem 20 extends above'the ground or through apla'tform 23 and is con- -wardly opening valve22radapted to seat on nected' to a pivoted lever 24: having an adjust able counter-balanced weight 25'at one'end.

The pistons 9 and 10 are shown" as connected :to a pivoted lever or walkingbeam 26 by the connecting rods 27cand 28, s The walking beam 26 is supported on a shaft 26 which may be rocked by appropriate mechanism; I

It the parts are assembled as shown and the piston 10 moveson its downward stroke, the

piston 9 will moveon its out stroke so pres- I surewill be exerted uponthe-liquid in the column or barrel t'closing the. valve 12 and forcing the liquid throu'ghfthe compartment or passage-way 7 and into the column or barrel 3. The momentum of the forced liquid [will cause thevalve llto unseat and permit water to be drawn from the compartment 6,'--

.the suction thereby created unseating the valve 2 2 toallow water-orfliquid in which the chamber 5 is submerged to flow into the column or barrel 3 so thatcitoanbe drawn into the cylinder 1 and escape through the" discharge port 29 VVhenthe piston 9 descends and the piston 10 moves on its suction st'rokethe valve ll will close and the valve '12;will open-so that liquid will be forced from the column or'barrel 3 through thecompartment? into the barrel or column 4. The valve 12 at this time being unseated so that liquid can be drawn from compartment ,6

creating a suction therein to unseat the valve 22; .The passageway or-Fcompartment 7T'is c constructed with respect ,to'the cross, sectional areas of the barrels 3 311(1'45 so that following the rate offlow, it is obvious-that the water will pass through the passageway '7, at ahigh velocity exertingan imector-ac- V,

structi-on of my pump.

tion on the water in compartment 6. due to opening or nozzle 30. The weight can be set so as to slightly over-balance the valve therefore when the pump is operated the suction created in compartment 6 will maintain the valve unseated, but when the pump stops theslight pre} )onderance of weight of the adjustable weight 5 will cause the valve to close.

It is understood of course that before the pump is first started it must first be primed because the discharge openings and 30 are above the water level and it should also be apparent that if the valve 22 remains unseated when the pistons were at rest the water in the cylinders and barrels would seek the level of the water in which the lower part of the ump was submerged and would spill out through the openings uncovered by either the valve 11 or 12 which happened to be unseated and then flow through the opening surrounded by the valve seat 18 but if the valve 22 is closed or seated there can be no escape of the water in barrels 3 and 4. Then the pump stops operating the operator can press down on the free end of the lever 24 and manually close the valve 24: but if the weight 25 is properly adjusted for slightly over-balancing valve 22, itwill be apparent that when the pump stops and the suction ceases in A, a slight opening impulse will be given to the valve 22 and this movement will be communicated to the lever arm 24 so the lever arm 24 will vibrate, so the operator at the top of the well will be apprised of the fact that the pump is properly functioning. i

It will be apparent from the foregoing that a pump constructed" in accordance with my invention is a combined lift and force pump and that the pistons are solid pistons properly packed, so there will'be no leakage of water past them and so that no air can enter the water columns or barrels, except through the discharge openings 29 and 30 whenthepistons are in their up positions.

An' important feature of my invention isthe actionof the water in the U-tube c on- Assuming that power is applied to the beam 26 the piston 10 starts onits up stroke thus Creating suc- "tio n upon the column ofliquid in the cylindownward force to the column. of liquidin the cylinder 8, this column having started on its downward course of its own accord, due to its loss of upward momentum and the action of gravity, so that the flap valve 11 is closed and the downward column of liquid compelled to pass through the compartment 7 to the cylinder 4 for the purpose of boosting the column of liquid 4' after the suction stroke of the piston 10 has been released by passing the point of discharge 30, such piston traveling through and remaining in its up position a sufficient length of time for the column of liquid to spend its momentum through the discharge opening 30, the object being to allow the natural forces of gravity and the momentum stored in the column of liquid to entirely expend themselves, thus at no time attempting to resist the action of momentum as is the case in most pumps, resulting" in my pump being of a higher eliiciency than pumps of the conventional type. V

In order to better illustrate the advantage gained by this construction, attention is called to the factthat it became necessary to install baflle plates in locomotive tenders in order to prevent the momentum stored in the water due to the side sway of the tender from overturning the same and I desire to utilize this power rather than work against it.

hat I claim and desire to secure by Letters-Patent is:

1. A pump comprising two cylindershaw ing inlets and outlets,a U-sh'aped connection between them, the U-shaped connectionhav ing inwardly openin'gvalves in the walls thereof, pistons 1n the cylinders and' means for simultaneously operating said pistonsin opposite directions.- a

I 2. A pump comprising two cylinders having inlet-s and-outlets, a U-shaped connection between them having inwardly opening valves in the wall thereof, a valved chamher communicating withthe U-shaped conuection when the inwardly opening valves are unseated, pistons in the cylinders and means for simultaneously operating said pistons in alternating opposite directions so that one piston functions as a compression piston whenthe other is functioning as a suction piston.

3. A pump comprising two cylinders having inlets and outlets, a U-shaped con'nec-b tion between them having inwardly'openi'ng valves in the wall thereof, a valved said pistons in alternating opposite directions so that one piston functions as a compression piston when the other is function' ing as a suction piston, the pistons having movement to alternately cover and uncover the outlets.

4:. A pump comprising two cylinders having outlets in the walls thereof, reciprocatory pistons in the cylinders having movements to cover and uncover the outlets, hollow columns connected to the cylinders, a semi-cylindrical chambered member connectingithe lower ends of the column and divided into two compartments, one of which is in constant communication with both columns and the other of which is in alternating communication with the respective columns the second mentioned compartment having a valve seat, a valve receivable on said seat having a stem, a lever connected to the stem and a counter balancin weight on the lever.

5. A pump comprising two cylinders having outletsin the walls thereof, a tubular member connected to the ends of the cylinders, a chamber connected to the ends of the tubular members and having a. partition to provide a passageway communicating with the ends of the cylinders, the passageway having a restricted port area, the wall on one side of the partition having valved port, the valve having inwardly opening movement and inwardly opening valves communicating the chamber with the tubular members and oppositely moving pistons in the cylinders.

6. A pump comprising two cylinders having outlets in the walls thereof, a tubular member connected to the ends of the cylindersQa chamber connected to the ends of the tubular members and having a partition to provide a passageway communicating with the ends of the cylinders, the passageway having a restricted port area, the wall on one side of the partition having a valved port, the valve having inwardly opening movement and inwardly opening flapvalves communicating the chamber with the tubular members and oppositely moving pistons in the cylinders.

7. A pump comp-rising two cylinders having outlets in the walls thereof, a tubular member connected to the ends of the cylinders, a chamber connected to the ends of the tubular members and having a partition to provide a passageway communicating with the ends of the cylinders, the passageway having a restricted port area, the wall on one side of the partition having a valved port, the valve having inwardly opening movement and inwardly opening flap valves communicating the chamber with the tubular members, said valves having fingers to contact with the part of the pump structure to limit the opening movement of the flap valves andoppositely moving pistons in the :yhn'ders,

8. A pump comp-rising two cylinders, having inlets and outlets, oppositely moving pistons in said cylinder, a tubular member connected to the inlets of said cylinders, a U-shaped member providing a passageway communicating with the ends of the tubular members, the passageway having an effective cross section less than the cross sections of the tubular members so that liquid passing from one tubular member to the other through the passageway will flow at increased velocity through the passageway and inwardly opening valves in the tubular members above the passageway.

9. A pump comprising two cylinders, having inlets and outlets, oppositely moving pistons in said cylinder, a tubular member connected to the inlets of said cylinders, a

U-shaped member providing a passageway communicating with the ends of the tubular members, the passageway having an effective cross section less than the cross sections of the tubular members so that liquid passing from one tubular member to the other through the passageway will flow at increased velocity through the passageway and inwardly opening valves in the tubular members above e V the passageway, a chamber above the pas sageway communicating with the tubular ,member through openings controlled by the inwardly opening valves and an inwardly V valve in the chamber.

10. A pump comprising two cylinders, pistons for the cylinders, and means for simultaneously actuating said pistons in alternating opposite directions, apertures in the side of the cylinders for'the discharge of the liquid, a bowl at the base of and connecting the cylinders, a semi-circular partition in such bowl, forming a confined pass ageway and communicating with the bot toms of each of said cylinders, and valves at the bottoms of each cylinder but having no relation with the confined passage-way.

11.;A pump comprising two cylinders, pistons for the cylinders, and means for simultaneously actuating said pistons in alternating opposite directions, apertures in the side of the cylinders for the discharge of the liquid, a bowl at the base of and connecting the cylinders, a semi-circular partition in such bowl forming a confined passage-way and communicating with the bot toms of each of said cylinders, valves at the bottoms of each cylinder. but having no relation with the confined passage-way and a 12. A pump comprising two cylinders,

iso

pistons for the cylinders, and means for simultaneously actuating said pistons in alternating opposite directions, apertures in the side of the e fiinder for the discharge of the liquid. a bowl at the base of andronnecting the cylinders, a semi-circular partition in 511011 bowl forming a confined passageway and communicating With the bottoms of each of said cylinders, valves at the bottoms of each cylinder but having no relation with the confined passageway, a valve in the bowl for permitting liquid to enter When the pistons are actuating and means foreclosing the, last named valve.

In testimony whereof I aflix niy signature.

FRED D. HOFFMAN-' 

